An OpenAI job listing described ambitions to build an ad network. Then the company deleted the references.

Sam Altman's OpenAI has been building up its ad business. Kevin Dietsch/Getty Images A version of this post appears in the CMO Insider newsletter. Sign up for Business Insider's weekly marketing newsletter. A recent OpenAI job listing hints that the AI giant is laying the groundwork for an ad network. So far, OpenAI's nascent ad business has been a platform for advertisers looking to reach ChatGPT users. Now, there's evidence that the AI giant might want to jump into a new side of the market…